Add test to reject merging of empty manifest.

Reviewers: ruiu, rnk

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D35954

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309317 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed